Increasing xp gained by dps classes in leveling dungeons

[Zojha]

But incentivizing is for those that are NOT set in stone.

Incentivizing is for everyone, it just varies in effectiveness depending on how much you dislike whatever is being incentivized. The idea behind it is to reward you something you do want in order to get you to do something you don't want and in order for that to work the thing you do want needs to have a stronger allure than the thing you don't want appalls.
Free Mog station item of choice per run? Even someone who really hates tanking/healing might take the bait. A free Krakka Root? You have to be very indifferent to make that influence your decision.

Either way, it's a temporary measure. Every reward incentive loses all value the moment you get it, be it a mount, minion, all the materia you need, all the currency you need or whatever. You induce a brief rush, then the effect evaporates and you're right back at the status quo. You might as well try to fix a leak by putting a bucket underneath it - at one point, you'll realize the bucket is full and the dripping water is ruining your carpet anyway. And honestly, when someone then suggests to solve it by getting another bucket... I am often lacking for words and feel the urge to facepalm.